Nonaqueous medium secondary battery

Abstract

Abstract PURPOSE:To obtain nonaqueous medium secondary battery of long life and high performance by using lithium or lighium alloy for a negative electrode and using a specific lighium manganic oxide for positive electrode active material. CONSTITUTION:Lithium or lighium alloy is used for a negative electrode 5, and a lighium magnetic oxide, which is obtained by adding lighium salt to a manganic oxide (gamma-MnOOH), having an X-ray fiffraction pattern shown in table I, and heat treating it and which has spinel structure, is used for positive electrode active material. This lithium manganic oxide (LiMn2O4) has, inside the crystal structure, vacant lattice points, which Li ions can invade, in the shape of being different in three dimensions, and it is small in grain degree and is large in specific surface area. Accordingly, during charge, the invasion and emission of Li ions of negative electrode active material into the positive electrode active material of a positive electrode 3 are done smoothly, and the collapse of the crystal structure by repeating charge and discharge can be suppressed. Hereby, a long life of nonaqueous medium secondary battery, wherein the capacity deterioration by a charge/discharge cycle is small, can be obtained.

Inventors

• 👤 Takumi Uchida
• 👤 内田　卓美
• 👤 Nobuaki Chiba
• 👤 千葉　信昭

Bibliographic Details